while True:
    print('系统正在运行...')
    print ('****菜单开始****')
    print (' 1 增加一个学生信息')
    print (' 2 删除一个学生信息')
    print (' 3 修改一个学生信息')
    print (' 4 查询一个学生信息')
    print (' 5 查询所有学生信息')
    print (' 6 排序')
    print (' 0 退出')
    print ('****菜单结束****')

    menu=int(input('请选择菜单：'))
    if menu==0:
        break
    elif menu == 1:
        print()
    elif menu == 2:
        print()
    elif menu == 3:
        print()
    elif menu == 4:
        print()
    elif menu == 5:
        list=['张三,18,男','王五,18,男','曹六,18,男']
        #print(list)
        for x in list:
            print(x)
            
    elif menu == 6:
        print()

    # menu=int(input('请选择菜单：'))
    # list=['张三,18,男\n','王五,18,男\n','曹六,18,男']
    # if menu==5:
    #    print(list)

print('程序结束!')


 